Most of the energy used by living things comes either directly or indirectly from where?

• Correct Answer: sun
• earth
• water
• horizon

Explanation: Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis . This is the process in which plants and certain other organisms (see Figure below ) synthesize glucose (C 6 H 12 O 6 ). The process uses carbon dioxide and water and also produces oxygen. The overall chemical equation for photosynthesis is:.

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